SAE 4340 Mod Structural and constructional steels
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SAE 4340 Mod Chemical Composition
SAE AMS 5330E: 1987 / Steel Castings, Investment 0.80Cr - 1.8Ni - 0.35Mo (0.38 - 0.46C) (SAE 4340 Modified) Annealed
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SAE 4340 Mod Physical Properties
Temperature
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SAE 4340 Mod Heat Treatments
- Annealed by heating to 845 +/- 15°C in an atmosphere neutral to the specified carbon range, holding at heat for not less than 1 hour and cooling as required. Hardened by heating, in an atmosphere neutral to the carbon content, to 815 +/- 15°C, holding at heat for not less than 30 minutes and quenching in oil, and double tempered by heating to a temperature not lower than 425°C, holding at heat for 2 hours +/- 0.25, and cooling in air, reheating to a temperature not lower than 425°C, holding at heat for 2 hours +/- 0.25, and cooling in air.
- Annealing temperature: 843°C (1550°F), cool at a rate not to exceed 111°C (200°F) per hour to below 538°C (1000°F). Normalizing temperature: 927°C (1700°F); Austenitizing temperature: 871°C (1600°F). Hardening quenchant: oil, polymer, inert gas. (Marquenching in a nitrate/nitrite salt bath, oil bath, or alternate quenchant operated at a set temperature applicable to the alloys processed is permitted. The parts shall be in the marquenching bath only for sufficient time to stabilize the parts at the bath temperature, but not less than 2 minutes, followed by cooling to approximately ambient temperature. Salt residues shall be removed by a hot water rinse before air tempering).
Tempering: 302°C (575°F), at least two tempering operations are required.
All parts, shall be in one of the following conditions prior to austenitizing: normalized, normalized or tempered or hardened. If those parts have been normalized only without tempering or overaging, they shall be preheated before exposure to the austenitizing temperature.
SAE 4340 Mod Mechanical Properties
Temperature
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SAE 4340 Mod International Equivalent Materials
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Equivalence categories reflect chemical-composition and mechanical-property comparison — always verify suitability against the governing specification for your application.
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